assume cs:code
data segment
    db 'conversation',0
data ends

code segment
    start:mov ax, data
          mov ds, ax
          mov si, 0
          mov ax, 0b800h
          mov es, ax
          mov di, 12*160
       s: cmp byte ptr [si], 0
          je ok
          mov al, [si]
          mov es:[di], al
          inc si
          add di, 2
          mov bx, offset s - offset ok
          int 7ch
      ok: mov ax, 4c00h
          int 21h
code ends
end start
